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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fb77e4bd20b30bf8ebe3e620072cf557be744d9b081d5d76e07d8b5a221d59e7' 
  AND token = 'Bkv+dCu43aORGFc9Qv14C8G2I6vFDjpW9oWLTMAOj1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}